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Brakes Level 3

AUTO 205

Brakes Level 3

AUTO 205

Course Description

Prerequisite: AUTO 155. Practices the diagnostic procedures and repair of braking systems. Practices NATEF tasks to MAST (Master Automotive Service Technology) level related to brake systems. (15-9)

Outcomes and Objectives

Complete general Level 3 NATEF tasks for Brakes as listed below.

Objectives:

  • Identify and interpret brake system concerns; determine necessary action.
  • Research applicable vehicle and service information, vehicle service history, service precautions, and technical service bulletins.
  • Describe procedure for performing a road test to check brake system operation; including an anti-lock brake system (ABS).

Complete Level 3 NATEF tasks related to Hydraulic Systems as listed below.

Objectives:

  • Diagnose pressure concerns in the brake system using hydraulic principles (Pascal’s Law).
  • Measure brake pedal height, travel, and free play (as applicable); determine necessary action.
  • Check master cylinder for internal/external leaks and proper operation; determine necessary action.
  • Remove, bench bleed, and reinstall master cylinder.
  • Diagnose poor stopping, pulling or dragging concerns caused by malfunctions in the hydraulic system; determine necessary action.
  • Inspect brake lines, flexible hoses, and fittings for leaks, dents, kinks, rust, cracks, bulging, and wear; check for loose fittings and supports; determine necessary action.
  • Replace brake lines, hoses, fittings, and supports.
  • Fabricate brake lines using proper material and flaring procedures (double flare and ISO types).
  • Select, handle, store, and fill brake fluids to proper level.
  • Inspect, test, and/or replace components of brake warning light system.
  • Identify components of brake warning light system.
  • Bleed and/or flush brake system.
  • Test brake fluid for contamination.

Complete Level 3 NATEF tasks related to Drum Brakes as listed below.

Objectives:

  • Diagnose poor stopping, noise, vibration, pulling, grabbing, dragging or pedal pulsation concerns; determine necessary action.
  • Remove, clean, inspect, and measure brake drum diameter; determine necessary action.
  • Refinish brake drum and measure final drum diameter; compare with specifications.
  • Remove, clean, and inspect brake shoes, springs, pins, clips, levers, adjusters/self-adjusters, other related brake hardware, and backing support plates; lubricate and reassemble.
  • Inspect wheel cylinders for leaks and proper operation; remove and replace as needed.
  • Pre-adjust brake shoes and parking brake; install brake drums or drum/hub assemblies and wheel bearings; perform final checks and adjustments.
  • Install wheel and torque lug nuts.

Complete Level 3 NATEF tasks related to Disc Brakes as listed below.

Objectives:

  • Diagnose poor stopping, noise, vibration, pulling, grabbing, dragging, or pulsation concerns; determine necessary action
  • Remove and clean caliper assembly; inspect for leaks and damage/wear to caliper housing; determine necessary action.
  • Clean and inspect caliper mounting and slides/pins for proper operation, wear, and damage; determine necessary action.
  • Remove, inspect, and replace pads and retaining hardware; determine necessary action.
  • Lubricate and reinstall caliper, pads, and related hardware; seat pads and inspect for leaks.
  • Clean and inspect rotor; measure rotor thickness, thickness variation, and lateral runout; determine necessary action.
  • Remove and reinstall rotor.
  • Refinish rotor on vehicle; measure final rotor thickness and compare with specifications.
  • Refinish rotor off vehicle; measure final rotor thickness and compare with specifications.
  • Retract and re-adjust caliper piston on an integrated parking brake system.
  • Check brake pad wear indicator; determine necessary action.
  • Describe importance of operating vehicle to burnish/break-in replacement brake pads according to manufacturer’s recommendations.

Complete Level 3 NATEF tasks related to Power-Assist Units as listed below.

Objectives:

  • Check brake pedal travel with, and without, engine running to verify proper power booster operation.
  • Check vacuum supply (manifold or auxiliary pump) to vacuum-type power booster.
  • Inspect vacuum-type power booster unit for leaks; inspect the check-valve for proper operation; determine necessary action.
  • Inspect and test hydraulically-assisted power brake system for leaks and proper operation; determine necessary action.
  • Measure and adjust master cylinder pushrod length.

Complete miscellaneous Brakes related (Wheel Bearings, Parking Brakes, Electrical, Etc.) Level 3 NATEF tasks as listed below.

Objectives:

  • Diagnose wheel bearing noises, wheel shimmy, and vibration concerns; determine necessary action.
  • Remove, clean, inspect, repack, and install wheel bearings; replace seals; install hub and adjust bearings.
  • Check parking brake cables and components for wear, binding, and corrosion; clean, lubricate, adjust or replace as needed.
  • Check parking brake operation and parking brake indicator light system operation; determine necessary action.
  • Check operation of brake stop light system.
  • Replace wheel bearing and race.
  • Remove and reinstall sealed wheel bearing assembly.

Complete Level 3 NATEF tasks related to Electronic Brake, Traction and Stability Control Systems as listed below.

Objectives:

  • Identify and inspect electronic brake control system components; determine necessary action.
  • Identify traction control/vehicle stability control system components.
  • Describe the operation of a regenerative braking system.
  • Diagnose poor stopping, wheel lock-up, abnormal pedal feel, unwanted application, and noise concerns associated with the electronic brake control system; determine necessary action.
  • Diagnose electronic brake control system electronic control(s) and components by retrieving diagnostic trouble codes, and/or using recommended test equipment; determine necessary action.
  • Depressurize high-pressure components of an electronic brake control system.
  • Bleed the electronic brake control system hydraulic circuits.
  • Test, diagnose, and service electronic brake control system speed sensors (digital and analog), toothed ring (tone wheel), and circuits using a graphing multimeter (GMM)/digital storage oscilloscope (DSO) (includes output signal, resistance, shorts to voltage/ground, and frequency data).
  • Diagnose electronic brake control system braking concerns caused by vehicle modifications (tire size, curb height, final drive ratio, etc.).